For close to a decade,Cubist Pharmaceuticals Inc. has mainly been a one-trick pony on the commercial front. Its primary focus has been its sole drug, Cubicin (daptomycin), approved for treatment of Gram-positive infections, including those caused by methicillin-resistant Staphylococcus aureus (MRSA), in 2003.
The company has successfully built the intravenous antibiotic into a drug approaching $1 billion in sales, no small feat in...